摘要
在计算参考作物蒸散量的模型中,FAO Penman-Monteith模型计算准确但需要气象参量过多,而Hargreaves模型只需要气温数据却无法保证较高的准确性。为了提高Hargreaves模型在中国不同气候类型条件下的适用性,以FAO Penman-Monteith模拟值为参考,建立了Hargreaves模型的修正系数。CLIMWAT数据库中156个站点的应用表明,修正前R2、RMSE分别为88.1%、3.803mm/d,修正后分别为97.3%、0.233mm/d;北京站多年的应用表明,修正前R2、RMSE分别为94.4%、4.861mm/d,修正后分别为97.2%、0.442mm/d。在此基础上,利用GIS分区运算工具建立了中国不同气候区域的修正系数表。研究结果有助于提高常规气象观测条件下(无风速、辐射观测)不同气候区域参考作物蒸散量的估算精度。
In the nxxiels of calculate reference crop evapotranspiration, FAO Penman-Monteith model calculates exactly but needs meteorological parameters too much. Hargreaves model just needs temperature which can＇t guarantee higher accuracy. To improve the applicability of Hargreaves model in different climatic types in China, this paper establishes revision coefficient of Hargreaves model taking FAO Penman-Monteith models for reference. According to the applies of 156 stations of CLIMWAT Database, before revising,R2 and RMSE are 88. 1% and 3. 803 mm/d while after revising,R2 and RMSE are 97.3% and 0. 233 mm/d. Based on the applies of data of years in Beijing, before revising,R2 and RMSE are 94. 4% and 4. 861 mm/d while after revising,R2 and RMSE are 97.2% and 0. 442 mm/d. On this basis, the table of revision coefficient is made in different climatic regions of China using zonal tool of GIS. Research results contribute to enhance the accuracy of estimating the reference crop evapotranspiration in different climatic regions under conditions of common meteorological observation （no data of wind and radiation）.
出处
《地理与地理信息科学》
CSCD
北大核心
2012年第1期51-54,F0003,共5页
Geography and Geo-Information Science
基金
国际科技合作项目(2010DFA92400)
国家自然科学基金项目(41101033)
北京市自然科学基金项目(8082010
8101002)
水利部公益性行业科研专项(200901091)
